When you have to get a number correct to X decimal places, you look at the number in X+1 place. If that number is 5 or more you add 1 to the number in X place, otherwise you leave the number in X place as it is. So, 5.9829 correct to three decimal places is 5.983,
And, 5.982 correct to two decimal places is 5.89
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33.487 is already rounded to three decimal places. if it were 33.4829, which is four decimal places, you would round it to the nearest three DECIMAL places, which would be 33.487. So, the answer to your question is; 33.487 is already rounded to three decimal places.
It's already written to three decimal places !
146.875 rounded to three decimal places is 147.
Rounded to three decimal places, this is equal to 1.397.
Leave it as it is because it is already in three decimal places